Figure 1-12 Fan Cabling - Silicon Graphics 1400 Server Family Maintenance And Upgrade Manual

The two installed fans nearest the 5.25-inch drive bays (fans 6 and 7) are separated
Note:
by a square piece of foam (the piece with a crescent-shaped hole) that extends
perpendicularly from the front of the fans (it is the rectangle between the round faces of
fans 6 and 7). You must remove this piece to access the two fans it separates (pull it
straight out).
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Figure 1-12
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Fan Cabling
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System Fans
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